Method for preparing hydrocracking catalyst

Abstract

The invention discloses a method for preparing a hydrocracking catalyst. The method comprises the following steps: (1) uniformly mixing modified Y molecular sieves, amorphous silica-alumina and / or alumina according to a certain proportioning ratio, adding dilute nitric acid into the mixture so as to carry out pulping, then, carrying out strip-extruding forming, drying and roasting so as to obtain a silica-alumina carrier containing the modified Y molecular sieves; and (2) then, dipping the carrier obtained in the step (1) by adopting a dipping solution containing active metals, and carrying out drying and roasting on the dipped carrier, so as to obtain the hydrocracking catalyst. A method for preparing the modified Y molecular sieves comprises the following processes of carrying out ammonium salt ion exchange on NaY zeolite which serves as initial powder, carrying out hydrothermal treatment, carrying out aluminum salt solution treatment, carrying out dipping in an organic solvent, then, carrying out rapid drying, carrying out alkali desiliconizing treatment, and carrying out drying and roasting, thereby obtaining the modified Y molecular sieves. The hydrocracking catalyst prepared by the method has good temperature rise sensitivity and operating flexibility and has a broad application prospect in hydrocracking reaction processes.

Description

technical field [0001] The invention relates to a preparation method of a hydrocracking catalyst. Background technique [0002] Hydrocracking technology has the characteristics of strong adaptability to raw materials, great flexibility in production operations and product plans, and good product quality. It can directly convert various heavy and low-quality feedstocks into high-quality jet fuel, diesel, and lubricating oil base materials that are urgently needed by the market. As well as chemical naphtha and tail oil steam cracking raw materials for ethylene production, it has become one of the most important heavy oil deep processing processes in modern oil refining and petrochemical industries, and has been increasingly widely used at home and abroad. The heart of the hydrocracking process is the hydrocracking catalyst. Hydrocracking catalyst is a typical dual-function catalyst, which has dual functions of hydrogenation and cracking. Among them, the hydrogenation functio...

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Problems solved by technology

[0003] At present, modified Y molecular sieve is the most widely used in hydrocracking process. The conventional treatment method has uniform distribution of silicon and aluminum inside and outside the molecular sieve, and uniform distribution of acid centers. When the silicon aluminum ratio of Y molecular sieve is reduced, the acid center density of Y molecular sieve is increased, and the The temperature sensitivity is improved, but at the same time, the secondary cracking is also greatly increased, and the hydrogen consumption is greatly increased

However, when the Y molecular sieve is subjected to advanced treatment and the acid density is too low, the temperature-raising sensitivity of the catalyst is poor.

[0004] CN200710158784.0 discloses a hydrocracking catalyst containing Y molecular sieve and its preparation method. In this invention, Y-type molecular sieve is obtained after hydrothermal treatment with a mixed aqueous solution of aluminum salt and acid, and the temperature-raising sensitivity of the prepared catalyst is Higher, but at the same time, the secondary cracking during the heating process increases significantly, and the hydrogen consumption increases significantly, which is not conducive to the stable operation of the industrial hydrocracking unit during the heating process

[0005] CN200810012212.6 discloses a hydrocracking catalyst carrier and its preparation method. The hydrocracking catalyst prepared by the invention has poor temperature raising sensitivity

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